metamorphic
Green serpentine or nephrite-like stone
Serpentinite, chiefly serpentine-group minerals; exact identification would require testing
AI-generated identification · may be incorrectTypically green to mottled dark green, waxy to greasy luster, fine-grained and massive; Mohs hardness about 2.5–4, with no obvious cleavage. The specimen appears opaque and naturally rough, possibly containing darker magnetite or chromite grains.
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Physical properties
Typically green to mottled dark green, waxy to greasy luster, fine-grained and massive; Mohs hardness about 2.5–4, with no obvious cleavage. The specimen appears opaque and naturally rough, possibly containing darker magnetite or chromite grains.
Formation & geological history
Forms when ultramafic mantle rocks, especially peridotite, undergo hydration and metamorphic alteration; commonly associated with ancient ophiolites and subduction zones, generally ranging from Precambrian to Recent geological settings.
Uses & applications
Low-grade material is used for carvings, ornaments, and decorative stone; tougher nephrite jade is used for jewelry and tools, while serpentinite has limited architectural use because of weathering and asbestos-related concerns.
Geological facts
Serpentine is a mineral group rather than one single mineral, including lizardite, antigorite, and chrysotile. Visual similarity to jade is common, but jade requires greater toughness and laboratory or gemological testing.
Field identification & locations
Common in California, New Zealand, Italy, Canada, Russia, and ophiolite belts worldwide; identify by its waxy green appearance, low hardness, and often soapy feel. Do not cut or abrade unknown serpentinite, as some varieties may contain fibrous chrysotile asbestos.
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